Three-coordinate measuring device and method

Abstract

The invention discloses a three-coordinate measuring device and method, and relates to the technical field of three-coordinate measurement, the three-coordinate measuring device comprises a base, an X-axis adjusting arm, a Y-axis adjusting arm and a Z-axis adjusting arm, the lower end of the Z-axis adjusting arm is provided with a measuring head, the lower end of the Z-axis adjusting arm is provided with a mounting hole and a fool-proof hole along the horizontal direction, and the base is provided with a measuring head replacement assembly. The supporting part is arranged at the upper end of the base, the blocking part is arranged at the upper end of the supporting part, and the blocking part comprises a first side baffle, a second side baffle and a third side baffle; the Z-axis adjusting arm is controlled to be close to the block part, and coordinates of the Z-axis adjusting arm in the horizontal direction and the vertical direction are adjusted; the electric screwdriver assembly is driven by the telescopic mechanism to get close to the mounting hole of the Z-axis adjusting arm, the mounting screw rod is unscrewed automatically, then the Z-axis adjusting arm is moved, the first rear baffle is used for blocking the measuring head, the Z-axis adjusting arm and the measuring head move relatively, and therefore the measuring head can be disassembled quickly.

Description

Technical Field

[0001] The present invention relates to the technical field of three-coordinate measurement, and in particular to a three-coordinate measurement device and method. Background Art

[0002] With the rapid development of modern industrial technology, three-dimensional coordinate measuring devices play a vital role in precision manufacturing, quality control and other fields. However, when replacing the measuring head of a traditional three-dimensional coordinate measuring device, the operator usually needs to do it manually. The specific steps include loosening the fastening screw first, then removing the measuring head connected to the lower end of the Z-axis adjustment arm, and finally installing the new measuring head and tightening the fastening screw. This manual replacement method has many shortcomings, such as low replacement efficiency, easy errors caused by human factors, and contamination caused by hand contact with the measuring head, which seriously affects the measurement accuracy and efficiency. Summary of the invention

[0003] In order to overcome the shortcomings of the above-mentioned prior art, the technical problem is: to provide a three-coordinate measuring device for automatically replacing measuring head components, aiming to solve the drawbacks of the traditional manual replacement method and improve the replacement efficiency and measurement accuracy.

[0004] The technical solution is: a three-coordinate measuring device, including a base and X-, Y- and Z-axis adjusting arms, a measuring head is installed at the lower end of the Z-axis adjusting arm, a mounting hole and an anti-fool hole are provided at the lower end of the Z-axis adjusting arm in the horizontal direction, a measuring head replacement assembly is provided on the base, which includes a supporting portion provided at the upper end of the base and a blocking portion provided at the upper end of the supporting portion, the blocking portion includes first, second and third side baffles, a first rear baffle is provided on one side between the first side baffle and the second side baffle, a second rear baffle is provided on the side between the second side baffle and the third side baffle opposite to the first rear baffle, a screwdriver mounting groove with a side opening is respectively provided at the upper end of the second side baffle and the third side baffle, the opening faces the first side baffle, and an electric screwdriver assembly and a telescopic mechanism for driving the electric screwdriver assembly to move horizontally toward the opening direction are respectively provided in the screwdriver mounting groove.

[0005] Furthermore, the electric screwdriver assembly includes a first spline sleeve, a first spline shaft, a screwdriver head and a first motor. The first spline sleeve is arranged in a screwdriver mounting groove through a first connecting frame. The first spline shaft is movably arranged in the first spline sleeve. The screwdriver head is arranged at one end of the first spline sleeve. First gears are respectively arranged on the first motor and the first spline shaft, and the two first gears are meshed.

[0006] Furthermore, the telescopic mechanism is an electric push rod or a micro cylinder, which is arranged on the first connecting frame. An axis frame is arranged at the end of the movable rod of the telescopic mechanism, and the axis frame is sleeved with the first spline sleeve.

[0007] Furthermore, the support portion is a hollow box structure, a support leg is provided between the support portion and the base, a slide rail is provided at the bottom of the support leg, and a track groove adapted to the slide rail is provided on the upper end surface of the base.

[0008] Furthermore, it also includes a measuring head conversion assembly, which includes a lifting structure vertically arranged at the bottom of the box body, the movable rod of the lifting structure is a tubular structure, a rotating member is arranged at its end, a cross plate is arranged at the upper end of the rotating member, a hole is arranged in the center of the cross plate and vertically penetrates its upper and lower surfaces, a second spline sleeve is arranged in the hole, a second spline shaft is arranged in the second spline sleeve, the upper end of the second spline shaft is connected to the second motor shaft, and the lower end penetrates the second spline sleeve and the rotating member in sequence and extends into the movable rod of the lifting structure; the second motor is fixedly arranged at the top of the box body, a receiving seat is respectively arranged at both ends of the cross plate, and a notch corresponding to the receiving seat is opened at the top of the box body, one of the notches is located between the first side baffle and the second side baffle, and the other notch is located between the second side baffle and the third side baffle.

[0009] Furthermore, it also includes a rotating mechanism respectively arranged at the bottom of the receiving seat, the rotating mechanism includes a third motor, a vertical shaft and a second gear, the third motor is arranged at the bottom of the horizontal plate, the vertical shaft penetrates the horizontal plate, the second gear is respectively arranged on the output shaft of the third motor and the vertical shaft, the second gears are meshed with each other, and the upper end of the vertical shaft is fixedly connected to the bottom center of the receiving seat.

[0010] Furthermore, a downward depression is provided on the top of the receiving seat, and the contour of the depression is adapted to the contour of the measuring head.

[0011] A method for using a three-coordinate measuring device comprises the following steps: Step 1: operate the Z-axis adjustment arm to approach the blocking portion, and adjust the horizontal and vertical coordinates of the Z-axis adjustment arm to allow the measuring head to enter between the first side baffle and the second side baffle; Step 2: Control the electric screwdriver assembly to move horizontally toward the opening direction, align the screwdriver head with the mounting hole and insert it, rotate the screwdriver head, and loosen the mounting screw; Step 3: The Z-axis adjustment arm moves toward the first rear baffle plate to separate the measuring head from the Z-axis adjustment arm; Step 4: The Z-axis adjustment arm enters between the second side baffle and the third side baffle, and aligns with the anti-fool hole, so that the measuring head is installed on the Z-axis adjustment arm, and another telescopic mechanism and electric screwdriver assembly are started. The screwdriver head rotates and tightens the mounting screw to complete the installation.

[0012] The beneficial effects are as follows: 1. The present invention actively approaches between the first side baffle and the second side baffle through the Z-axis adjustment arm, drives the electric screwdriver assembly to approach the mounting hole of the Z-axis adjustment arm through the telescopic mechanism, and automatically loosens the mounting screw, then moves the Z-axis adjustment arm and uses the first rear baffle to block the measuring head, so that the Z-axis adjustment arm and the measuring head move relative to each other, thereby completing the rapid disassembly of the measuring head. When replacing other measuring heads, the Z-axis adjustment arm is controlled to move between the second side baffle and the second side baffle, and the electric screwdriver assembly is driven by the telescopic mechanism to tighten the screw. The device greatly reduces the time and effort of manual operation. At the same time, through automated control, the disassembly and installation of the measuring head can be realized, significantly improving the replacement efficiency.

[0013] 2. The present invention adopts an automatic replacement method, which reduces the chances of workers manually touching the measuring head, thereby reducing the possibility of contamination. This is of great significance for maintaining the cleanliness and accuracy of the measuring head.

[0014] 3. The present invention uses a measuring head conversion assembly to achieve position replacement of two receiving seats by rotation, so that when the measuring head is subsequently replaced, the measuring head to be replaced can be automatically raised and appear at a designated position waiting for replacement.

[0015] 4. The present invention can fine-tune the receiving seat by setting a rotating mechanism, and can adjust the angle of the measuring head placed in the receiving seat. When an angle deviation occurs when the measuring head is placed, its angle can be adjusted by the rotating mechanism to adapt to the corresponding mounting hole and anti-fool hole at the lower end of the Z-axis adjustment arm. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0017] Figure 2 A schematic diagram of setting fool-proof holes and mounting holes for the Z-axis adjustment arm of the present invention.

[0018] Figure 3 It is a schematic diagram of the support part, the blocking part and the electric screwdriver assembly of the present invention.

[0019] Figure 4 It is a schematic structural diagram of the box body and the blocking part of the present invention, wherein the box body is a longitudinal section.

[0020] Figure 5 It is a three-dimensional structural schematic diagram of the electric screwdriver assembly and the telescopic mechanism of the present invention.

[0021] Figure 6 It is an exploded schematic diagram of the first spline sleeve and the first spline shaft of the present invention.

[0022] Figure 7It is a schematic structural diagram of the cross plate, receiving seat, lifting structure, rotating member, second motor, second spline shaft and second spline sleeve of the present invention, wherein the second spline shaft, rotating member and second spline sleeve are in a separated state.

[0023] Figure 8 It is a three-dimensional structural schematic diagram of the receiving seat, the third motor, the vertical shaft and the second gear of the present invention.

[0024] Fig. 9 It is a schematic diagram of the structure in which a track groove is arranged on the base and a slide rail is arranged on the supporting leg of the present invention.

[0025] Parts names and serial numbers in the figure: 1_base, 1a_Z-axis adjustment arm, 1b_foolproof hole, 1c_mounting hole, 1d_track groove, 2_leg, 3_box, 31a_notch, 4_blocking part, 41a_first side baffle, 41b_second side baffle, 41c_third side baffle, 42a_first rear baffle, 42b_second rear baffle, 43_screwdriver installation slot, 5_electric screwdriver assembly, 51a-first Spline sleeve, 51b_screwdriver head, 52_first spline shaft, 53_first motor, 54_first gear, 56_first connecting frame, 61_cross plate, 62_receiving seat, 62a-recess, 63_lifting structure, 64_rotating part, 65_second motor, 66_second spline shaft, 67_second spline sleeve, 7_third motor, 71_vertical shaft, 72_second gear, 8_telescopic mechanism, 81_axis frame. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "first" and "second" are for the purpose of clearly explaining the numbering of product components and do not represent any substantial difference. The directions of "upper" and "lower" shall be based on the directions shown in the accompanying drawings. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to the specific circumstances. In addition, the meaning of "multiple" is two or more. In the specification, "and / or" means at least one of the connected objects, and the character " / " generally indicates that the previously associated objects are in an "or" relationship.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Figure 1 The three-dimensional structural diagram of the three-coordinate measuring device is shown. In the prior art, the three-coordinate measuring device includes a base 1 and X, Y, and Z axis adjustment arms, wherein the measuring head is installed at the lower end of the Z axis adjustment arm 1a. The measuring head is usually installed by clamping and then fastened by a locking screw. A screw mounting hole 1c and an anti-fool hole 1b adapted to the measuring head are respectively horizontally arranged on two adjacent surfaces at the lower end of the Z axis adjustment arm 1a. When replacing the measuring head in the prior art, it is generally manually operated to loosen the screw and then disassemble it. The difference between the present invention and the prior art is that it also includes a measuring head replacement assembly, and the measuring head replacement assembly includes a support portion arranged at the upper end of the base 1, such as Fig. 9 As shown, the support part is a hollow box 3 structure, a support leg 2 is arranged between the support part and the base 1, a slide rail is arranged at the bottom of the support leg 2, and a track groove 1d adapted to the slide rail is arranged on the upper end surface of the base 1, and the track groove 1d is located near one of the center lines on the base 1, and the position of the measuring head replacement assembly is fixed. By inputting the coordinates of the corresponding measuring head replacement assembly into the central control system of the three-coordinate measuring device, the measuring head can be quickly and accurately approached to the measuring head replacement assembly. When the measuring head does not need to be replaced, the measuring head replacement assembly can be taken out of the track groove 1d.

[0030] refer to Figure 1-4 The blocking portion 4 is arranged on the upper end surface of the supporting portion, and the blocking portion 4 includes first, second and third side baffles. A first rear baffle 42a is arranged on a side between the first side baffle 41a and the second side baffle 41b, and a second rear baffle 42b is arranged between the second side baffle 41b and the third side baffle 41c and on a side opposite to the first rear baffle 42a. It should be noted that the height of the first rear baffle 42a and the second rear baffle 42b are slightly lower than the height of the first side baffle or the second side baffle or the third side baffle, so that when the measuring head is disassembled, the first rear baffle 42a or the second rear baffle 42b will not interfere with the passage of the Z-axis adjustment arm 1a.

[0031] like Figure 5-6As shown, it is particularly important to explain that the upper ends of the second side baffle 41b and the third side baffle 41c are respectively provided with a screwdriver installation slot 43 with a side opening, the opening of the screwdriver installation slot 43 faces the first side baffle 41a, and a detachable dust cover is provided on the top thereof. The screwdriver installation slot 43 is respectively provided with an electric screwdriver assembly 5 and a telescopic mechanism 8 for driving the electric screwdriver assembly 5 to move horizontally toward the opening direction. The telescopic mechanism 8 can be a micro electric push rod or a micro cylinder, such as Figure 5 As shown, the electric screwdriver assembly 5 includes a first spline sleeve 51a, a first spline shaft 52, a screwdriver head 51b and a first motor 53. The first spline sleeve 51a is arranged in the screwdriver mounting groove 43 through the first connecting frame 56. The orientation of the first spline sleeve 51a is consistent with the orientation of the opening of the screwdriver mounting groove 43. The first spline shaft 52 is movably arranged in the first spline sleeve 51a. The screwdriver head 51b is arranged at one end of the first spline sleeve 51a facing the opening of the screwdriver mounting groove 43. The screwdriver head 51b can be replaced. According to the shape of the screw head, it can be replaced with a straight-shaped or cross-shaped one. The first motor 53 is arranged at the bottom of the screwdriver mounting groove 43. A first gear 54 is respectively arranged on the first motor 53 and the first spline shaft 52, and the two first gears 54 are meshed. The telescopic mechanism 8 is fixedly mounted on the first connecting frame 56, and the telescopic mechanism 8 and the first spline sleeve 51a are oriented in the same direction. The end of the movable rod of the telescopic mechanism 8 is fixedly mounted with a shaft frame 81, which is a bearing frame, and a bearing is disposed on its inner ring, and the inner ring of the bearing is fixedly sleeved on the first spline sleeve 51a. The shaft frame 81 can also be other similar structures.

[0032] Working principle: the first motor 53 and the telescopic mechanism 8 are connected to the controller of the measuring device, and the Z-axis adjustment arm 1a is moved to between the first side baffle 41a and the second side baffle 41b through the input coordinate axis. After adjusting the position, the telescopic mechanism 8 drives the first spline sleeve 51a to move toward the mounting hole 1c, and the screwdriver head 51b extends into the mounting hole 1c and abuts against the screw head. Then the first motor 53 drives the first spline shaft 52, the first spline sleeve 51a and the screwdriver head to rotate through the first gear 54, and the screwdriver head 51b rotates slowly. During this period, the telescopic mechanism 8 drives the first spline sleeve 51a to fine-tune toward the mounting hole 1c so that the screwdriver head and the screw head coincide. The rotation direction of the screwdriver head 51b is reverse rotation relative to the screw, and the screw is loosened. Then, the Z-axis adjustment arm 1a moves toward the first rear baffle 42a. At this time, the first rear baffle 42a blocks the movement of the measuring head, causing it to move relative to the Z-axis adjustment arm 1a, thereby completing the disassembly of the measuring head.

[0033] After the disassembly is completed, the Z-axis adjustment arm 1a moves between the second side baffle plate 41b and the third side baffle plate 41c, and is engaged with the measuring head to be replaced placed between the second side baffle plate 41b and the third side baffle plate 41c. Then, the telescopic mechanism 8 on the third side baffle plate 41c drives the electric screwdriver assembly 5 to move toward the mounting hole 1c, and then the screw is tightened by rotating, thereby completing the replacement of the measuring head.

[0034] like Figure 7 As shown, it also includes a measuring head conversion assembly, which includes a lifting structure 63 vertically arranged at the bottom of the box body 3. The lifting structure 63 preferably adopts an electric push rod or a cylinder. The movable rod of the lifting structure 63 is set as a tubular structure. A rotating member 64 is set at the upper end of the movable rod. The rotating member 64 is a bearing. The outer ring of the bearing is fixedly connected to the cross plate 61 through a flange, and the inner ring of the bearing is fixedly connected to the movable rod. The center of the cross plate 61 is provided with a hole vertically penetrating the upper and lower surfaces thereof, and a second spline shaft sleeve 67 is provided in the hole. A second spline shaft 66 is provided in the second spline shaft sleeve 67. The upper end of the second spline shaft 66 is connected to the lower end of the rotating shaft of the second motor 65, which passes through the second spline shaft sleeve 67, the rotating member 64 in sequence and extends into the movable rod of the lifting structure 63. The second motor 65 is fixed at the top of the box body 3. A receiving seat 62 is respectively provided at both ends of the cross plate 61. A notch 31a corresponding to the receiving seat 62 is opened on the top of the box body 3, one of the notches 31a is located between the first side baffle 41a and the second side baffle 41b, and the other notch 31a is located between the second side baffle 41b and the third side baffle 41c.

[0035] The second motor 65 drives the second spline shaft 66 to rotate, which can drive the cross plate 61 to rotate, so that the two receiving seats 62 can be interchanged, and the lifting structure 63 can drive the receiving seat 62 to rise and fall. In order to further improve the stability of replacing the measuring head, the receiving seat 62 can play a role in supporting and limiting the measuring head during the replacement process. In addition, the top surface of the receiving seat 62 is also provided with a downward recess 62a, and the contour of the recess 62a is adapted to the contour of the measuring head. In a preferred embodiment, one side of the recess 62a is also provided with a side opening, and the width of the side opening allows the measuring head to pass through.

[0036] The replaced measuring head is received by the receiving seat 62 located between the first side baffle plate 41a and the second side baffle plate 41b, and is driven into the interior of the box body 3 by the lifting structure 63. Then the second motor 65 drives the cross plate 61 to rotate through the second spline shaft 66 and the second spline shaft sleeve 67. In this embodiment, the cross plate 61 rotates 180° each time. After the disassembled measuring head changes its position, it is driven to rise by the lifting structure 63 during the next replacement process, and then enters between the second side baffle plate 41b and the third side baffle plate 41c to wait for replacement. The corresponding receiving seat 62 located between the first side baffle plate 41a and the second side baffle plate 41b is in an empty state at this time, and is used to receive the measuring head to be replaced. In summary, by setting a measuring head conversion component, the replacement efficiency and the stability of the replacement process can be further optimized.

[0037] It should be further explained that a plurality of receiving seats 62 can be provided, and the receiving seats 62 are arranged in a circular array with the second spline sleeve 67 as the center. In this case, there are more options for replacing the measuring head, and the corresponding rotation angle of the cross plate 61 can also be adaptively adjusted.

[0038] like Figure 8 As shown, the present invention also includes a rotating mechanism respectively arranged at the bottom of the receiving seat 62, the rotating mechanism includes a third motor 7, a vertical shaft 71 and a second gear 72, the third motor 7 is arranged at the bottom of the horizontal plate 61, the vertical shaft 71 penetrates the horizontal plate 61, the second gear 72 is respectively arranged on the output shaft of the third motor 7 and the vertical shaft 71, the second gears 72 are meshed with each other, and the upper end of the vertical shaft 71 is fixedly connected to the bottom center of the receiving seat 62.

[0039] The present invention also includes a method for using a three-coordinate measuring device, which specifically includes the following steps: Step 1: manipulate the Z-axis adjustment arm 1a to approach the blocking portion 4, adjust the horizontal and vertical coordinates of the Z-axis adjustment arm 1a, and allow the measuring head to enter between the first side baffle 41a and the second side baffle 41b; Step 2: Start the telescopic mechanism 8, which drives the electric screwdriver assembly 5 to move horizontally toward the opening direction, align the screwdriver head 51b with the mounting hole 1c and extend it into the mounting hole, and rotate the screwdriver head 51b to loosen the mounting screw; Step 3: The Z-axis adjustment arm 1a moves toward the first rear baffle 42a to separate the measuring head from the Z-axis adjustment arm 1a; Step 4: The Z-axis adjustment arm 1a enters between the second side baffle 41b and the third side baffle 41c, and aligns with the anti-fool hole 1b to install the measuring head on the Z-axis adjustment arm 1a, starts another telescopic mechanism 8 and the electric screwdriver assembly 5, and the screwdriver head 51b rotates and tightens the installation screw to complete the installation.

[0040] The use of the device can not only save manpower and improve the efficiency of replacing the measuring head, but also reduce the process of human contact with the measuring head and avoid contamination of the measuring head.

[0041] The above-mentioned embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person skilled in the art, several modifications, improvements and substitutions can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A three-coordinate measuring device, comprising a base (1) and X-axis, Y-axis, and Z-axis adjusting arms, wherein a measuring head is mounted on the lower end of the Z-axis adjusting arm (1a), and a mounting hole (1c) and an anti-fool hole (1b) are provided on the lower end of the Z-axis adjusting arm (1a) along a horizontal direction, characterized in that: The base (1) is provided with a measuring head replacement assembly, comprising a support portion provided at the upper end of the base (1) and a blocking portion (4) provided at the upper end of the support portion, the blocking portion (4) comprising a first, a second and a third side baffle plate, a first rear baffle plate (42a) being provided on a side between the first side baffle plate (41a) and the second side baffle plate (41b), a second rear baffle plate (42b) being provided on a side between the second side baffle plate (41b) and the third side baffle plate (41c) and opposite to the first rear baffle plate (42a), the upper ends of the second side baffle plate (41b) and the third side baffle plate (41c) are respectively provided with a screwdriver installation groove (43) with a side opening, the opening facing the first side baffle plate (41a), and the screwdriver installation groove (43) is respectively provided with an electric screwdriver assembly (5) and a telescopic mechanism (8) for driving the electric screwdriver assembly (5) to move horizontally in the direction of the opening.

2. The three-coordinate measuring device according to claim 1, characterized in that: The electric screwdriver assembly (5) comprises a first spline shaft sleeve (51a), a first spline shaft (52), a screwdriver head (51b) and a first motor (53); the first spline shaft sleeve (51a) is arranged in a screwdriver mounting slot (43) via a first connecting frame (56); the first spline shaft (52) is movably arranged in the first spline shaft sleeve (51a); the screwdriver head (51b) is arranged at one end of the first spline shaft sleeve (51a); and first gears (54) are respectively arranged on the first motor (53) and the first spline shaft (52); the two first gears (54) are meshed.

3. The three-coordinate measuring device according to claim 2, characterized in that: The telescopic mechanism (8) is an electric push rod or a micro cylinder, which is arranged on the first connecting frame (56). The end of the movable rod of the telescopic mechanism (8) is provided with a shaft frame (81), and the shaft frame (81) is sleeved with the first spline shaft sleeve (51a).

4. The three-coordinate measuring device according to claim 3, characterized in that: The support portion is a hollow box body (3) structure, a support leg (2) is provided between the support portion and the base (1), a slide rail is provided at the bottom of the support leg (2), and a track groove (1d) adapted to the slide rail is provided on the upper end surface of the base (1).

5. The three-coordinate measuring device according to claim 4, characterized in that: The measuring head conversion assembly also includes a lifting structure (63) vertically arranged at the bottom of the box body (3); the movable rod of the lifting structure (63) is a tubular structure, and a rotating member (64) is arranged at its end; a horizontal plate (61) is arranged at the upper end of the rotating member (64); a hole vertically penetrating the upper and lower surfaces of the horizontal plate (61) is arranged at the center of the horizontal plate (61); a second spline shaft sleeve (67) is arranged in the hole; a second spline shaft (66) is arranged in the second spline shaft sleeve (67); the upper end of the second spline shaft (66) is connected to the rotating shaft of the second motor (65); and the lower end of the second spline shaft (66) is sequentially penetrated The second spline shaft sleeve (67) and the rotating member (64) extend into the movable rod of the lifting structure (63); the second motor (65) is fixedly arranged at the top of the box body (3); a receiving seat (62) is respectively arranged at both ends of the cross plate (61); and a notch (31a) corresponding to the receiving seat (62) is opened at the top of the box body (3), wherein one of the notches (31a) is located between the first side baffle (41a) and the second side baffle (41b), and the other notch (31a) is located between the second side baffle (41b) and the third side baffle (41c).

6. The three-coordinate measuring device according to claim 5, characterized in that: The invention also includes a rotating mechanism respectively arranged at the bottom of the receiving seat (62), the rotating mechanism comprising a third motor (7), a vertical shaft (71) and a second gear (72), the third motor (7) being arranged at the bottom of the horizontal plate (61), the vertical shaft (71) penetrating the horizontal plate (61), the second gear (72) being respectively arranged on the output shaft of the third motor (7) and the vertical shaft (71), the second gear (72) being meshed with each other, and the upper end of the vertical shaft (71) being fixedly connected to the bottom center of the receiving seat (62).

7. The three-coordinate measuring device according to claim 6, characterized in that: The top of the receiving seat (62) is provided with a downward recess (62a), and the contour of the recess (62a) is adapted to the contour of the measuring head.

8. The method for using the three-coordinate measuring device according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: Manipulate the Z-axis adjustment arm (1a) to approach the blocking portion (4), and adjust the horizontal and vertical coordinates of the Z-axis adjustment arm (1a) so that the measuring head enters between the first side baffle (41a) and the second side baffle (41b); Step 2: Control the screwdriver assembly (5) to move horizontally toward the opening direction, align the screwdriver head (51b) with the mounting hole (1c) and insert it, rotate the screwdriver head (51b) to loosen the mounting screw; Step 3: The Z-axis adjustment arm (1a) moves toward the first rear baffle (42a) to separate the measuring head from the Z-axis adjustment arm (1a); Step 4: The Z-axis adjustment arm (1a) is inserted between the second side baffle (41b) and the third side baffle (41c), and is aligned with the anti-fool hole (1b) so that the measuring head is installed on the Z-axis adjustment arm (1a). Another telescopic mechanism (8) and the electric screwdriver assembly (5) are started, and the screwdriver head (51b) is rotated to tighten the installation screw to complete the installation.

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